Enterprise Controllers
In a modern enterprise architecture disk array controllers are parts of physically independent enclosures, such as disk arrays placed in a storage area network (SAN) or network-attached storage (NAS) servers.
Those external disk arrays are usually purchased as an integrated subsystem of RAID controllers, disk drives, power supplies, and management software. It is up to controllers to provide advanced functionality (various vendors name these differently):
- automatic failover to another controller (transparent to computers transmitting data)
- long-running operations performed without downtime
- forming a new RAID set
- reconstructing degraded RAID set (after a disk failure)
- adding a disk to online RAID set
- removing a disk from a RAID set (rare functionality)
- partitioning a RAID set to separate volumes/LUNs
- snapshots
- Business Continuance Volumes (BCV)
- replication with a remote controller....
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